Electric lamp socket shell



Feb; 12, 1935; G. H. ELWELL 1,990,729

ELECTRIC LAMP SOCKET SHELL Filed Aug. 17, 1927 Patented Feb. 1 2, 19 35I t r Q 'UNITEDQYSTATEVS PATENT OFFICE ELECTRIC LAIWP SOCKET SHELLGeorge Henry Elwell, New Haven, Conn, assignor to The GreistManufacturing Company, a corporation of Connecticut Application August17, 1927, Serial No. 213,669

2 Claims. 01. 173-362 The invention relates to improvements inelecscrew-thread 3, beginning as at and continutric lamp socket shellsand. especially to the maning (as illustrated in dotted line by theFigure 3) nor of impermanent assembly of a socket shell around theopposite side portion of the shell 1 and a shade holder, and the objectof the invenand ending on the visible portion of the shell 5 tion is toprovide the shell, of a lamp socket with 1, as at 6, its course insubstantially encompassing 5 a screw-thread not only adapted to receivea the shell 1 lies throughout its length in one and corresponding threadof a part to be thereby asthe same radial pl Of the p Socketsembled tothe shell, but to bindingly obstruct vioustothis impr v ment it w h u htnecesthatpart upon the completion of the assembly. to provide a a u aShoulder, y means The following is the description of the invenof aspecial beading or other formation of the 10 tion, reference being hadto the accompanying Shell, a st which the a r e of an drawing (onesheet) in whi h the Figure 1 i ternally threaded shade holder (notillustrated) a side elevation of a socket shell provided with m h n a ina p r l p ane here o limit the improvement; the Figure 2 is an oppositeand bindingly lock'the holder in its threaded side elevation of the sameshell; and the Figure assembly p an externally aded Shell. This 15 3illustrates more clearly the course of the thread improvement, hOWeVer,Provides or the t eaded formed in the shell, While the im r nt iassembly of such a holder upon the screw-thread illustrated only inconnection with an electric 3 n a n e thread e d 4 with a similar lampsocket shell it will be obvious that it may 'leslllt d therefore o y elmina es the I16- 20 be applied to the construction of any screweessity fpr v n a p i l i u pr '20 thread, and this wide application of theinvenduees in a Single p at on of co struction a sinj ti is herebyantiqipated gle thread element capable of the dual accom Referring moreparticularly to the drawing, in plishment f p v in a thr d as m ly ndwhich similar parts are similarly numbered, the 3180 a bindinglimitation of that assembly dordinary type of l t i 1 k t m is ing tohold the assembled part rigidly in place. 25

illustrated as having the shell 1 and the cap 2 What I claim is:-separably assembled in any desired manner An electric a Socket Shell aVg 8- y ink o t th art, R ll d, or th i formed drical wall and-strands ofa screw-thread formed in the metal of the 511611 1 adja t it lamp uponand encircling said wall, the top strand of receiving end, is thescrew-thread3 encompassing Said ad being in a P e no mal to 30 theperiphery of the shell 1, The course of thi the axis of the shell forthe purpose herein set screw-thread 3, in a manner well known to theforth- 7 p art, continuously emerges from one to the next 2.A'n'electric lamp socket shell having a cylinof the several parallelradial planes of the lamp drical wall and projecting strands of a screwsocket in which the thread lies. The formation thread formed in saidwall, the top strand of said 35 and course of the thread end 4, however,con- Screw-thread being in a plane normal to the axis stitutes theimprovement provided by this inof the shell for the purpose herein setforth. vention and, while the thread end 4 is an un- 7 broken andunobstructed continuance .of the GEORGE HENRY ELWELL.

